<div class="section">
    <div class="row">
        <div class="col m12 center">
            <span class="blue-grey-text text-lighten-4" style="font-size:180px;">404</span>
            <h6 class="brown-text text-lighten-1">
                页面不存在
            </h6>
        </div>
    </div>
    <div class="row">
        <div class="col m12 center">
            <button class="btn waves-effect yellow darken-4" type="button" onclick="return history.back();">返回</button>
        </div>
    </div>
</div>